全氘代聚乙烯泡沫的制备与表征

摘要

Fully deuterated polyethylene foam has higher D/C ratio and is urgently in ICF. Deuterated polyethylene foam has been fabricated at the first time by thermally induced phase separation technique and freeze drying technique. The structural morphology of the perdeu-terated foam is charactered by SEM, showing its density to be 20-60 mg/cm3, corresponding to the mean pore size of 0. 2-10 μm. The results of characterization by solid ' H NMR and TG, show that the foam has a good thermal stability and a dependable deuteration ratio.%全氘代聚乙烯泡沫具有较高D/C值(因为C-D键比C-H键有更大的裂解能,因而更加稳定),是激光惯性约束聚变(ICF)实验中急需的靶材料.采用聚合物溶液的热致相分离技术,首次通过冷冻干燥制备出具有开放状网络孔洞结构的低密度氘代聚乙烯泡沫,并研究了泡沫制备过程中影响结构的因素.采用扫描电镜对泡沫结构进行表征,结果表明,在密度为20～60 mg/cm3时,其平均孔径对应为0.2～10 μm.利用固体核磁共振、热重对最终氘代聚乙烯泡沫的氘代率和热稳定性能进行了分析,结果显示,合成的氘代聚乙烯泡沫具有较好的热稳定性和稳定的氘代率.